the murmurous sea

The study started from: I can't hoist const function...?! Why...? A. Declaring Variables www.youtube.com/watch?v=dzEieWaOJE0&t=5s www.youtube.com/watch?v=j-9_15QBW2s B. Temporal Dead Zone It's because of : Unlike variables declared with var, which will start with the value undefined, let variables are not initialized until their definition is evaluated. : Accessing the variable before the initia..

After //1. var console.log('typeof minus:', typeof minus) console.log('minus(5,1):', minus(5,1)) var minus = (a,b) => a - b; //typeof minus: undefined //Uncaught TypeError: minus is not a function at check.js:4 //(anonymous) @ check.js:4 //2. const console.log('typeof minus:', typeof minus) console.log('minus(5,1):', minus(5,1)) const minus = (a,b) => a - b; //Uncaught ReferenceError: Cannot acc..

1. method 2. returns a Promise. 3. As the then and Promise.prototype.catch() methods return promises, they can be chained — an operation called composition. 4. returns a Promise which allows for method chaining. [Syntax] p.then(onFulfilled[, onRejected]); p.then(value => { // fulfillment }, reason => { // rejection }); onFulfilled Optional A Function called if the Promise is fulfilled. : has one..